This snoop filter keeps track of which connected port has a particular line of data. More...

#include <snoop_filter.hh>

Inheritance diagram for SnoopFilter:

Classes
struct	ReqLookupResult
	A request lookup must be followed by a call to finishRequest to inform the operation's success. More...

struct	SnoopItem
	Per cache line item tracking a bitmask of SlavePorts who have an outstanding request to this line (requested) or already share a cache line with this address (holder). More...

Public Types
typedef std::vector< QueuedSlavePort * >	SnoopList

Public Types inherited from SimObject
typedef SimObjectParams	Params

Public Member Functions
	SnoopFilter (const SnoopFilterParams *p)

void	setSlavePorts (const SnoopList &slave_ports)
	Init a new snoop filter and tell it about all the slave ports of the enclosing bus. More...

std::pair< SnoopList, Cycles >	lookupRequest (const Packet *cpkt, const SlavePort &slave_port)
	Lookup a request (from a slave port) in the snoop filter and return a list of other slave ports that need forwarding of the resulting snoops. More...

void	finishRequest (bool will_retry, Addr addr, bool is_secure)
	For an un-successful request, revert the change to the snoop filter. More...

std::pair< SnoopList, Cycles >	lookupSnoop (const Packet *cpkt)
	Handle an incoming snoop from below (the master port). More...

void	updateSnoopResponse (const Packet *cpkt, const SlavePort &rsp_port, const SlavePort &req_port)
	Let the snoop filter see any snoop responses that turn into request responses and indicate cache to cache transfers. More...

void	updateSnoopForward (const Packet *cpkt, const SlavePort &rsp_port, const MasterPort &req_port)
	Pass snoop responses that travel downward through the snoop filter and let them update the snoop filter state. More...

void	updateResponse (const Packet *cpkt, const SlavePort &slave_port)
	Update the snoop filter with a response from below (outer / other cache, or memory) and update the tracking information in the snoop filter. More...

virtual void	regStats ()
	Callback to set stat parameters. More...

Public Member Functions inherited from SimObject
virtual	~SimObject ()

virtual const std::string	name () const

virtual void	init ()
	init() is called after all C++ SimObjects have been created and all ports are connected. More...

virtual void	loadState (CheckpointIn &cp)
	loadState() is called on each SimObject when restoring from a checkpoint. More...

virtual void	initState ()
	initState() is called on each SimObject when not restoring from a checkpoint. More...

virtual void	regProbePoints ()
	Register probe points for this object. More...

virtual void	regProbeListeners ()
	Register probe listeners for this object. More...

ProbeManager *	getProbeManager ()
	Get the probe manager for this object. More...

virtual Port &	getPort (const std::string &if_name, PortID idx=InvalidPortID)
	Get a port with a given name and index. More...

virtual void	startup ()
	startup() is the final initialization call before simulation. More...

DrainState	drain () override
	Provide a default implementation of the drain interface for objects that don't need draining. More...

virtual void	memWriteback ()
	Write back dirty buffers to memory using functional writes. More...

virtual void	memInvalidate ()
	Invalidate the contents of memory buffers. More...

void	serialize (CheckpointOut &cp) const override
	Serialize an object. More...

void	unserialize (CheckpointIn &cp) override
	Unserialize an object. More...

const Params *	params () const

	SimObject (const Params *_params)

Public Member Functions inherited from EventManager
EventQueue *	eventQueue () const

void	schedule (Event &event, Tick when)

void	deschedule (Event &event)

void	reschedule (Event &event, Tick when, bool always=false)

void	schedule (Event *event, Tick when)

void	deschedule (Event *event)

void	reschedule (Event *event, Tick when, bool always=false)

void	wakeupEventQueue (Tick when=(Tick) -1)

void	setCurTick (Tick newVal)

	EventManager (EventManager &em)

	EventManager (EventManager *em)

	EventManager (EventQueue *eq)

Public Member Functions inherited from Serializable
	Serializable ()

virtual	~Serializable ()

void	serializeSection (CheckpointOut &cp, const char *name) const
	Serialize an object into a new section. More...

void	serializeSection (CheckpointOut &cp, const std::string &name) const

void	unserializeSection (CheckpointIn &cp, const char *name)
	Unserialize an a child object. More...

void	unserializeSection (CheckpointIn &cp, const std::string &name)

Public Member Functions inherited from Drainable
DrainState	drainState () const
	Return the current drain state of an object. More...

virtual void	notifyFork ()
	Notify a child process of a fork. More...

Public Member Functions inherited from Stats::Group
	Group (Group parent, const char name=nullptr)
	Construct a new statistics group. More...

virtual	~Group ()

virtual void	resetStats ()
	Callback to reset stats. More...

virtual void	preDumpStats ()
	Callback before stats are dumped. More...

void	addStat (Stats::Info *info)
	Register a stat with this group. More...

const std::map< std::string, Group * > &	getStatGroups () const
	Get all child groups associated with this object. More...

const std::vector< Info * > &	getStats () const
	Get all stats associated with this object. More...

void	addStatGroup (const char name, Group block)
	Add a stat block as a child of this block. More...

const Info *	resolveStat (std::string name) const
	Resolve a stat by its name within this group. More...

	Group ()=delete

	Group (const Group &)=delete

Group &	operator= (const Group &)=delete

Static Public Attributes
static const int	SNOOP_MASK_SIZE = 256

Protected Types
typedef std::bitset< SNOOP_MASK_SIZE >	SnoopMask
	The underlying type for the bitmask we use for tracking. More...

typedef std::unordered_map< Addr, SnoopItem >	SnoopFilterCache
	HashMap of SnoopItems indexed by line address. More...

Protected Member Functions
std::pair< SnoopList, Cycles >	snoopAll (Cycles latency) const
	Simple factory methods for standard return values. More...

std::pair< SnoopList, Cycles >	snoopSelected (const SnoopList &slave_ports, Cycles latency) const

std::pair< SnoopList, Cycles >	snoopDown (Cycles latency) const

SnoopMask	portToMask (const SlavePort &port) const
	Convert a single port to a corresponding, one-hot bitmask. More...

SnoopList	maskToPortList (SnoopMask ports) const
	Converts a bitmask of ports into the corresponing list of ports. More...

Protected Member Functions inherited from Drainable
	Drainable ()

virtual	~Drainable ()

virtual void	drainResume ()
	Resume execution after a successful drain. More...

void	signalDrainDone () const
	Signal that an object is drained. More...

Private Types
enum	LineStatus { LineSecure = 0x01 }
	Use the lower bits of the address to keep track of the line status. More...

Private Member Functions
void	eraseIfNullEntry (SnoopFilterCache::iterator &sf_it)
	Removes snoop filter items which have no requesters and no holders. More...

Private Attributes
SnoopFilterCache	cachedLocations
	Simple hash set of cached addresses. More...

struct SnoopFilter::ReqLookupResult	reqLookupResult

SnoopList	slavePorts
	List of all attached snooping slave ports. More...

std::vector< PortID >	localSlavePortIds
	Track the mapping from port ids to the local mask ids. More...

const unsigned	linesize
	Cache line size. More...

const Cycles	lookupLatency
	Latency for doing a lookup in the filter. More...

const unsigned	maxEntryCount
	Max capacity in terms of cache blocks tracked, for sanity checking. More...

Stats::Scalar	totRequests
	Statistics. More...

Stats::Scalar	hitSingleRequests

Stats::Scalar	hitMultiRequests

Stats::Scalar	totSnoops

Stats::Scalar	hitSingleSnoops

Stats::Scalar	hitMultiSnoops

Additional Inherited Members
Static Public Member Functions inherited from SimObject
static void	serializeAll (CheckpointOut &cp)
	Serialize all SimObjects in the system. More...

static SimObject *	find (const char *name)
	Find the SimObject with the given name and return a pointer to it. More...

Static Public Member Functions inherited from Serializable
static const std::string &	currentSection ()
	Gets the fully-qualified name of the active section. More...

static void	serializeAll (const std::string &cpt_dir)

static void	unserializeGlobals (CheckpointIn &cp)

Protected Attributes inherited from SimObject
const SimObjectParams *	_params
	Cached copy of the object parameters. More...

Protected Attributes inherited from EventManager
EventQueue *	eventq
	A pointer to this object's event queue. More...

Detailed Description

This snoop filter keeps track of which connected port has a particular line of data.

It can be queried (through lookup*) on memory requests from above (reads / writes / ...); and also from below (snoops). The snoop filter precisely knows about the location of lines "above" it through a map from cache line address to sharers/ports. The snoop filter ties into the flows of requests (when they succeed at the lower interface), regular responses from below and also responses from sideway's caches (in update*). This allows the snoop filter to model cache-line residency by snooping the messages.

The tracking happens in two fields to be able to distinguish between in-flight requests (in requested) and already pulled in lines (in holder). This distinction is used for producing tighter assertions and tracking request completion. For safety, (requested | holder) should be notified and the requesting MSHRs will take care of ordering.

Overall, some trickery is required because: (1) snoops are not followed by an ACK, but only evoke a response if they need to (hit dirty) (2) side-channel information is funnelled through direct modifications of pkt, instead of proper messages through the bus (3) there are no clean evict messages telling the snoop filter that a local, upper cache dropped a line, making the snoop filter pessimistic for now (4) ordering: there is no single point of order in the system. Instead, requesting MSHRs track order between local requests and remote snoops

Definition at line 86 of file snoop_filter.hh.

Member Typedef Documentation

◆ SnoopFilterCache

typedef std::unordered_map<Addr, SnoopItem> SnoopFilter::SnoopFilterCache

protected

HashMap of SnoopItems indexed by line address.

Definition at line 220 of file snoop_filter.hh.

◆ SnoopList

typedef std::vector<QueuedSlavePort*> SnoopFilter::SnoopList

Definition at line 92 of file snoop_filter.hh.

◆ SnoopMask

typedef std::bitset<SNOOP_MASK_SIZE> SnoopFilter::SnoopMask

protected

The underlying type for the bitmask we use for tracking.

This limits the number of snooping ports supported per crossbar.

Definition at line 206 of file snoop_filter.hh.

Member Enumeration Documentation

◆ LineStatus

enum SnoopFilter::LineStatus

private

Use the lower bits of the address to keep track of the line status.

Enumerator
LineSecure	block holds data from the secure memory space

Definition at line 307 of file snoop_filter.hh.

Constructor & Destructor Documentation

◆ SnoopFilter()

SnoopFilter::SnoopFilter ( const SnoopFilterParams * p )

inline

Definition at line 94 of file snoop_filter.hh.

Referenced by regStats().

Member Function Documentation

◆ eraseIfNullEntry()

void SnoopFilter::eraseIfNullEntry ( SnoopFilterCache::iterator & sf_it )

private

Removes snoop filter items which have no requesters and no holders.

Definition at line 53 of file snoop_filter.cc.

References cachedLocations, DPRINTF, SnoopFilter::SnoopItem::holder, and SnoopFilter::SnoopItem::requested.

Referenced by finishRequest(), lookupSnoop(), snoopDown(), updateResponse(), and updateSnoopForward().

◆ finishRequest()

void SnoopFilter::finishRequest	(	bool	will_retry,
		Addr	addr,
		bool	is_secure
	)

For an un-successful request, revert the change to the snoop filter.

Also take care of erasing any null entries. This method relies on the result from lookupRequest being stored in reqLookupResult.

Parameters

will_retry	This request will retry on this bus / snoop filter
addr	Packet address, merely for sanity checking

Definition at line 156 of file snoop_filter.cc.

References cachedLocations, DPRINTF, eraseIfNullEntry(), SnoopFilter::SnoopItem::holder, SnoopFilter::ReqLookupResult::it, LineSecure, linesize, reqLookupResult, SnoopFilter::SnoopItem::requested, and SnoopFilter::ReqLookupResult::retryItem.

Referenced by CoherentXBar::recvAtomicBackdoor(), CoherentXBar::recvTimingReq(), and setSlavePorts().

◆ lookupRequest()

std::pair< SnoopFilter::SnoopList, Cycles > SnoopFilter::lookupRequest	(	const Packet *	cpkt,
		const SlavePort &	slave_port
	)

Lookup a request (from a slave port) in the snoop filter and return a list of other slave ports that need forwarding of the resulting snoops.

Additionally, update the tracking structures with new request information. Note that the caller must also call finishRequest once it is known if the request needs to retry or not.

Parameters

cpkt	Pointer to the request packet. Not changed.
slave_port	Slave port where the request came from.

Returns: Pair of a vector of snoop target ports and lookup latency.

Definition at line 64 of file snoop_filter.cc.

References cachedLocations, Packet::cacheResponding(), DPRINTF, Packet::fromCache(), Packet::getBlockAddr(), hitMultiRequests, hitSingleRequests, SnoopFilter::SnoopItem::holder, Packet::isBlockCached(), Packet::isEviction(), Packet::isSecure(), SlavePort::isSnooping(), SnoopFilter::ReqLookupResult::it, LineSecure, linesize, lookupLatency, maskToPortList(), Port::name(), Packet::needsResponse(), panic_if, portToMask(), Packet::print(), Packet::req, reqLookupResult, SnoopFilter::SnoopItem::requested, SnoopFilter::ReqLookupResult::retryItem, snoopDown(), snoopSelected(), and totRequests.

Referenced by CoherentXBar::recvAtomicBackdoor(), CoherentXBar::recvTimingReq(), and setSlavePorts().

◆ lookupSnoop()

std::pair< SnoopFilter::SnoopList, Cycles > SnoopFilter::lookupSnoop ( const Packet * cpkt )

Handle an incoming snoop from below (the master port).

These can upgrade the tracking logic and may also benefit from additional steering thanks to the snoop filter.

Parameters

cpkt	Pointer to const Packet containing the snoop.

Returns: Pair with a vector of SlavePorts that need snooping and a lookup latency.

Definition at line 182 of file snoop_filter.cc.

References cachedLocations, DPRINTF, eraseIfNullEntry(), Packet::getBlockAddr(), hitMultiSnoops, hitSingleSnoops, SnoopFilter::SnoopItem::holder, Packet::isInvalidate(), Packet::isRequest(), Packet::isSecure(), Packet::isWriteback(), LineSecure, linesize, lookupLatency, maskToPortList(), maxEntryCount, Packet::needsWritable(), panic_if, Packet::print(), Packet::req, SnoopFilter::SnoopItem::requested, snoopDown(), snoopSelected(), and totSnoops.

Referenced by CoherentXBar::recvAtomicSnoop(), CoherentXBar::recvTimingSnoopReq(), and setSlavePorts().

◆ maskToPortList()

SnoopFilter::SnoopList SnoopFilter::maskToPortList ( SnoopMask ports ) const

inlineprotected

Converts a bitmask of ports into the corresponing list of ports.

Parameters

ports SnoopMask of the requested ports

Returns: SnoopList containing all the requested SlavePorts

Definition at line 332 of file snoop_filter.hh.

References MipsISA::p, portToMask(), and slavePorts.

Referenced by lookupRequest(), lookupSnoop(), and snoopDown().

◆ portToMask()

SnoopFilter::SnoopMask SnoopFilter::portToMask ( const SlavePort & port ) const

inlineprotected

Convert a single port to a corresponding, one-hot bitmask.

Parameters

port	SlavePort that should be converted.

Returns: One-hot bitmask corresponding to the port.

Definition at line 323 of file snoop_filter.hh.

References Port::getId(), InvalidPortID, SlavePort::isSnooping(), and localSlavePortIds.

Referenced by lookupRequest(), maskToPortList(), snoopDown(), updateResponse(), and updateSnoopResponse().

◆ regStats()

void SnoopFilter::regStats ( )

virtual

Callback to set stat parameters.

This callback is typically used for complex stats (e.g., distributions) that need parameters in addition to a name and a description. Stat names and descriptions should typically be set from the constructor usingo from the constructor using the ADD_STAT macro.

Reimplemented from Stats::Group.

Definition at line 389 of file snoop_filter.cc.

References Stats::DataWrap< Derived, InfoProxyType >::desc(), hitMultiRequests, hitMultiSnoops, hitSingleRequests, hitSingleSnoops, SimObject::name(), Stats::DataWrap< Derived, InfoProxyType >::name(), Stats::Group::regStats(), SnoopFilter(), totRequests, and totSnoops.

Referenced by setSlavePorts().

◆ setSlavePorts()

void SnoopFilter::setSlavePorts ( const SnoopList & slave_ports )

inline

Init a new snoop filter and tell it about all the slave ports of the enclosing bus.

Parameters

slave_ports Slave ports that the bus is attached to.

Definition at line 107 of file snoop_filter.hh.

References addr, fatal_if, finishRequest(), InvalidPortID, localSlavePortIds, lookupRequest(), lookupSnoop(), MipsISA::p, regStats(), slavePorts, updateResponse(), updateSnoopForward(), and updateSnoopResponse().

Referenced by CoherentXBar::init().

◆ snoopAll()

std::pair<SnoopList, Cycles> SnoopFilter::snoopAll ( Cycles latency ) const

inlineprotected

Simple factory methods for standard return values.

Definition at line 225 of file snoop_filter.hh.

References slavePorts.

◆ snoopDown()

std::pair<SnoopList, Cycles> SnoopFilter::snoopDown ( Cycles latency ) const

inlineprotected

Definition at line 234 of file snoop_filter.hh.

References eraseIfNullEntry(), maskToPortList(), and portToMask().

Referenced by lookupRequest(), and lookupSnoop().

◆ snoopSelected()

std::pair<SnoopList, Cycles> SnoopFilter::snoopSelected	(	const SnoopList &	slave_ports,
		Cycles	latency
	)		const

inlineprotected

Definition at line 229 of file snoop_filter.hh.

Referenced by lookupRequest(), and lookupSnoop().

◆ updateResponse()

void SnoopFilter::updateResponse	(	const Packet *	cpkt,
		const SlavePort &	slave_port
	)

Update the snoop filter with a response from below (outer / other cache, or memory) and update the tracking information in the snoop filter.

Parameters

cpkt	Pointer to const Packet holding the snoop response.
slave_port	SlavePort that made the original request and is the target of this response.

Definition at line 336 of file snoop_filter.cc.

References cachedLocations, DPRINTF, eraseIfNullEntry(), Packet::getBlockAddr(), SnoopFilter::SnoopItem::holder, Packet::isInvalidate(), Packet::isResponse(), Packet::isSecure(), SlavePort::isSnooping(), LineSecure, linesize, Port::name(), panic_if, portToMask(), Packet::print(), Packet::req, and SnoopFilter::SnoopItem::requested.

Referenced by CoherentXBar::recvAtomicBackdoor(), CoherentXBar::recvTimingReq(), CoherentXBar::recvTimingResp(), and setSlavePorts().

◆ updateSnoopForward()

void SnoopFilter::updateSnoopForward	(	const Packet *	cpkt,
		const SlavePort &	rsp_port,
		const MasterPort &	req_port
	)

Pass snoop responses that travel downward through the snoop filter and let them update the snoop filter state.

No additional routing happens.

Parameters

cpkt	Pointer to const Packet holding the snoop response.
rsp_port	SlavePort that sends the response.
req_port	MasterPort through which the response is forwarded.

Definition at line 299 of file snoop_filter.cc.

References cachedLocations, Packet::cacheResponding(), DPRINTF, eraseIfNullEntry(), Packet::getBlockAddr(), Packet::hasSharers(), SnoopFilter::SnoopItem::holder, Packet::isResponse(), Packet::isSecure(), LineSecure, linesize, Port::name(), Packet::print(), and SnoopFilter::SnoopItem::requested.

Referenced by CoherentXBar::forwardAtomic(), CoherentXBar::recvTimingSnoopResp(), and setSlavePorts().

◆ updateSnoopResponse()

void SnoopFilter::updateSnoopResponse	(	const Packet *	cpkt,
		const SlavePort &	rsp_port,
		const SlavePort &	req_port
	)

Let the snoop filter see any snoop responses that turn into request responses and indicate cache to cache transfers.

These will update the corresponding state in the filter.

Parameters

cpkt	Pointer to const Packet holding the snoop response.
rsp_port	SlavePort that sends the response.
req_port	SlavePort that made the original request and is the destination of the snoop response.

Definition at line 242 of file snoop_filter.cc.

References cachedLocations, Packet::cacheResponding(), DPRINTF, Packet::getBlockAddr(), Packet::hasSharers(), SnoopFilter::SnoopItem::holder, Packet::isResponse(), Packet::isSecure(), SlavePort::isSnooping(), Packet::isWriteback(), LineSecure, linesize, Port::name(), panic_if, portToMask(), Packet::print(), Packet::req, and SnoopFilter::SnoopItem::requested.

Referenced by CoherentXBar::forwardAtomic(), CoherentXBar::recvTimingSnoopResp(), and setSlavePorts().

Member Data Documentation

◆ cachedLocations

SnoopFilterCache SnoopFilter::cachedLocations

private

Simple hash set of cached addresses.

Definition at line 261 of file snoop_filter.hh.

Referenced by eraseIfNullEntry(), finishRequest(), lookupRequest(), lookupSnoop(), updateResponse(), updateSnoopForward(), and updateSnoopResponse().

◆ hitMultiRequests

Stats::Scalar SnoopFilter::hitMultiRequests

private

Definition at line 315 of file snoop_filter.hh.

Referenced by lookupRequest(), and regStats().

◆ hitMultiSnoops

Stats::Scalar SnoopFilter::hitMultiSnoops

private

Definition at line 319 of file snoop_filter.hh.

Referenced by lookupSnoop(), and regStats().

◆ hitSingleRequests

Stats::Scalar SnoopFilter::hitSingleRequests

private

Definition at line 314 of file snoop_filter.hh.

Referenced by lookupRequest(), and regStats().

◆ hitSingleSnoops

Stats::Scalar SnoopFilter::hitSingleSnoops

private

Definition at line 318 of file snoop_filter.hh.

Referenced by lookupSnoop(), and regStats().

◆ linesize

const unsigned SnoopFilter::linesize

private

Cache line size.

Definition at line 298 of file snoop_filter.hh.

Referenced by finishRequest(), lookupRequest(), lookupSnoop(), updateResponse(), updateSnoopForward(), and updateSnoopResponse().

◆ localSlavePortIds

std::vector<PortID> SnoopFilter::localSlavePortIds

private

Track the mapping from port ids to the local mask ids.

Definition at line 296 of file snoop_filter.hh.

Referenced by portToMask(), and setSlavePorts().

◆ lookupLatency

const Cycles SnoopFilter::lookupLatency

private

Latency for doing a lookup in the filter.

Definition at line 300 of file snoop_filter.hh.

Referenced by lookupRequest(), and lookupSnoop().

◆ maxEntryCount

const unsigned SnoopFilter::maxEntryCount

private

Max capacity in terms of cache blocks tracked, for sanity checking.

Definition at line 302 of file snoop_filter.hh.

Referenced by lookupSnoop().

◆ reqLookupResult

struct SnoopFilter::ReqLookupResult SnoopFilter::reqLookupResult

private

Referenced by finishRequest(), lookupRequest(), and SnoopFilter::ReqLookupResult::ReqLookupResult().

◆ slavePorts

SnoopList SnoopFilter::slavePorts

private

List of all attached snooping slave ports.

Definition at line 294 of file snoop_filter.hh.

Referenced by maskToPortList(), setSlavePorts(), and snoopAll().

◆ SNOOP_MASK_SIZE

const int SnoopFilter::SNOOP_MASK_SIZE = 256

static

Definition at line 90 of file snoop_filter.hh.

◆ totRequests

Stats::Scalar SnoopFilter::totRequests

private

Statistics.

Definition at line 313 of file snoop_filter.hh.

Referenced by lookupRequest(), and regStats().

◆ totSnoops

Stats::Scalar SnoopFilter::totSnoops

private

Definition at line 317 of file snoop_filter.hh.

Referenced by lookupSnoop(), and regStats().

The documentation for this class was generated from the following files:

mem/snoop_filter.hh
mem/snoop_filter.cc

Classes

Public Types

Public Member Functions

Static Public Attributes

Protected Types

Protected Member Functions

Private Types

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ SnoopFilterCache

◆ SnoopList

◆ SnoopMask

Member Enumeration Documentation

◆ LineStatus

Constructor & Destructor Documentation

◆ SnoopFilter()

Member Function Documentation

◆ eraseIfNullEntry()

◆ finishRequest()

◆ lookupRequest()

◆ lookupSnoop()

◆ maskToPortList()

◆ portToMask()

◆ regStats()

◆ setSlavePorts()

◆ snoopAll()

◆ snoopDown()

◆ snoopSelected()

◆ updateResponse()

◆ updateSnoopForward()

◆ updateSnoopResponse()

Member Data Documentation

◆ cachedLocations

◆ hitMultiRequests

◆ hitMultiSnoops

◆ hitSingleRequests

◆ hitSingleSnoops

◆ linesize

◆ localSlavePortIds

◆ lookupLatency

◆ maxEntryCount

◆ reqLookupResult

◆ slavePorts

◆ SNOOP_MASK_SIZE

◆ totRequests

◆ totSnoops